IRVING, Tex., Dec. 12 -- Bill Parcells had reached deep into his bag of coaching tricks to save not only the Dallas Cowboys' season, but maybe his tenure with the team. He had entrusted everything to a veteran quarterback and two young offensive linemen whom he had little reason at the time to trust, and it had paid off. He had tried a couple of gadget plays that had worked perfectly, and his players and the fans at Texas Stadium were celebrating a close victory over the Kansas City Chiefs.